A remote peer can crash any full node by sending a RequestBatchSet message containing the genesis block's hash. The handler calls get epoch chunks which iterates backwards through macro blocks using Policy::macro block before. When it reaches the genesis block number, macro block before panics with "No macro blocks before genesis block".

The patch for this vulnerability is formally released as part of v1.5.0.

No Workaround, although requesting the genesis batch set is not used during normal operation.

See PR.